Headphone



FIG. 1 is a perspective view of a headphone;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view, showing our design.

The broken lines are directed to environment that illustrate portions of the headphone; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a headphone, as shown and described. 